Denning, D. E., “Cyber Security as an Emergent Infrastructure,”in
Bombs and Bandwidth: The Emerging Relationship between IT and Security
(Robert Latham ed.), The New Press, 2003. (.pdf
of prepublication version)

Denning, D. E., “Activism, Hacktivism, and
Cyberterrorism: The Internet as a Tool for Influencing Foreign Policy,”
Nautilus Institute. A revised version appeared in The Computer
Security Journal, Vol. XVI, No. 3, Summer 2000, pp. 15-35. A
further revision appeared in Networks and Netwars : The Future of
Terror, Crime, and Militancy, J. Arquilla and D. F. Ronfeldt (eds),
2001, pp. 239-288. (.pdf)
There is also a "Postscript on China" written in 2006 for a Japanese
publication. (.pdf)

Denning, D. E.,
Disarming the Black Hats? When Does a Security Tool Become a Cyberweapon,
Information Security Magazine, October 2000. (.html)

Denning, D. E. and Baugh, W. E. Jr.,
Encryption and Evolving Technologies: Tools of Organized Crime and
Terrorism, US Working Group on Organized Crime, National Strategy
Information Center, June 1997. (.pdf)